Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free The previous commit 0718a78f6a9f ("ALSA: usb-audio: Kill timer properly at removal") patched a UAF issue caused by the error timer. However, because the error timer kill added in this patch occurs after the endpoint delete, a race condition to UAF still occurs, albeit rarely. Additionally, since kill-cleanup for urb is also missing, freed memory can be accessed in interrupt context related to urb, which can cause UAF. Therefore, to prevent this, error timer and urb must be killed before freeing the heap memory.
References
- https://git.kernel.org/stable/c/353d8c715cc951a980728133c9dd64ca5a0a186c
- https://git.kernel.org/stable/c/647d6b8d22be12842fde6ed0c56859ebc615f21e
- https://git.kernel.org/stable/c/9f2c0ac1423d5f267e7f1d1940780fc764b0fee3
- https://git.kernel.org/stable/c/af600e7f5526d16146b3ae99f6ad57bfea79ca33
- https://git.kernel.org/stable/c/dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647ba
FAQ
What is CVE-2025-39997?
CVE-2025-39997 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free The previous commit 0718a78f6a9f ("ALSA: usb-audio: Kill timer prop...
How severe is CVE-2025-39997?
CVSS scoring is not yet available for CVE-2025-39997. Check NVD for updates.
Is there a patch for CVE-2025-39997?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.